import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'

Vue.use(VueRouter)

const routes = [
  {
    path:'/',
    redirect:'/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect:'/welcome',
    children:[
      {
      path: '/welcome',
      component: Welcome
    },
    {
      path:'/users',
      component:Users
    }
  ]
  },
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to,from,next)=>{
  //to：将要访问的路径
  //from：代表从哪个路径跳转而来
  //next：是一个函数，表示放行
  // next() 放行   next('/login') 强制跳转
  if(to.path==='/login') return next();
  //获取token
  const tokenStr=window.sessionStorage.getItem('token');
  if(!tokenStr) return next('/login');
  next();
})

export default router
